After a few days of downtime, most of the site is back-up again. A quote from discord explaining the situation:
we are sorry for the inconveniences with the webserver in the last couple of days. And especially sorry for not keeping you properly up to date, truth is, we had hopes of it being recovered.
Sadly, something as trivial as a RAM upgrade on a server cascaded into our provider (ServerHub) breaking our entire filesystem.
We are now in the process of moving to an ever better webserver. The good news are, @Aahz , had created a back-up a few days ago into his network. He saved us again, from something that could have been absolutely tragic and horribly timed. While it's